Changes in horizontal oculomotor behaviour coincide with a shift in visual motion perception |
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Authors: | Thilo K V Guerraz M Bronstein A M Gresty M A |
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Institution: | MRC Human Movement and Balance Unit, National Hospital for Neurology and Neurosurgery, London, UK. |
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Abstract: | During full-field rotation of the visual field, subjects commonly experience an initial perception of object-motion which 'switches' to a perception of self-motion. We studied the characteristics of the horizontal optokinetic nystagmus responses evoked by a moving visual stimulus in these two perceptual states over a range of stimulus velocities. During self-motion perception mean eye position was found to shift more in the direction of the newly appearing stimulus elements with a slight reduction in slow phase gain in comparison to the nystagmus evoked during object-motion perception. The results may reflect a modified strategy of spatial attention with increased emphasis on anticipatory eye movements during visually induced self-motion perception. |
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